Stopping Power of 0.5-1.5MeV Protons in Mylar Tinyiko S. Maluleke 1 - - PowerPoint PPT Presentation

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Jun 15, 2023 330 likes •440 views

Stopping Power of 0.5-1.5MeV Protons in Mylar Tinyiko S. Maluleke 1 Supervisors: C. Pineda-Vargas 2 M. Msimanga 2 V. Kuzmin 3 1 Stellenbosch University, 2 iThemba Labs, 3 JINR AIM To measure the experimental stopping power for protons

SLIDE 1

Stopping Power of 0.5-1.5MeV Protons in Mylar

Tinyiko S. Maluleke1 Supervisors: C. Pineda-Vargas2

M. Msimanga2
V. Kuzmin3

1 Stellenbosch University, 2 iThemba Labs, 3 JINR

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20090924 South African Summer Student Practice '09 2

AIM

To measure the experimental stopping power

for protons in mylar (C10H8O4).

To compare the current results with theoretical

calculations and previous experimental results.

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20090924 South African Summer Student Practice '09 3

INTRODUCTION

Stopping Power S:
It can be expressed as sum of electronic and

nuclear stopping power:

S= 1 N dE dx S=SeSn

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EXPERIMENTAL SETUP

Beam: 0.5-

1.5MeV

Foil Thickness
Mylar: 1.68μm
Primary Target:

Pt/C

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20090924 South African Summer Student Practice '09 5

RESULTS (RBS Spectrum)

C1 – Pt-scattered 1H+
C2 – Pt-scattered 1H+

through the foil.

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RESULTS (Calibration)

Scattered proton energy:

where kinematic factor K: θ – Scattering angle M1 – Projectile mass M2 – Target nuclei mass

E1=KE0

K=[

M 2

2−M 1 2sin 2 1 2M 2cos

M 1M 2

]

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RESULTS (Stopping Power)

The energy loss
f protons in

mylar foil is rather small (less than 20% of E1).

Stopping power is

evaluated at average energy, Eavg.

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20090924 South African Summer Student Practice '09 8

RESULTS

Stopping power:

if where: and is foil thickness, at

S≈ E x

 E=E1−E2

Eavg= E1E 2 2  E E1 0.20

 x

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CONCLUSION

Current results deviates from theory and

previous results by 5-10%.

There may be error in thickness of foil.

SIMNRA calculations gives mass of foil as 1.82μm, which yield good correspondence.

Therefore mass of foil has to be comfirmed by

weighing method.

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20090924 South African Summer Student Practice '09 10